Xanthilekk, Resurrected Tyrant

Multiattack. Xanthilekk makes three attacks: two with its bite and one with its tail. It can't make both attacks against the same target.

Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 42 (5d12 + 10) piercing damage. If the target is a Large or smaller creature, it is grappled (escape DC 20). Until this grapple ends, the target is restrained, and Xanthilekk can't bite another target.

Tail. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 30 (5d8 + 10) bludgeoning damage.

Tyrant's Presence. All creatures within 120 feet of Xanthilekk, Resurrected Tyrant that can see it must make a DC 20 Wisdom saving through or be subject to the effect of the Command Spell: Kneel. 

Thunderous Roar. Xanthilekk can use a bonus action to let out a roar that rivals the dragons in their breath weapons. Each creature within 200 feet of Xanthilekk must make a DC 20 Constitution saving through or suffer 8d10 Thunder damage and become deafened on a failure and half as much on a success and bot become deafened.